There is a long list of reasons why we all hate acne, and the last thing that we want is a constant reminder, in the form of a depressed scar, of a once mammoth (or so it seemed at the time) pimple. This article from Fox News gives us solutions to four common skin problems, one of them being scars. Here's what they had to say.

Scars
As skin heals from a wound, it can produce too much collagen and a scar
forms. The tendency to scar is genetic, so there’s not much you can do
to prevent scars, though you can minimize the effects. Hypertrophic
scars, the most common kind, are raised but don’t extend past the
borders of the original wound. Keloids are raised but grow beyond the
wound’s edges; people of African descent most often suffer from them.
Depressed scars, like those from acne, are exactly that―indented.

Fraxel laser: Best for depressed scars, this laser targets pinpoint-wide
areas of skin, resurfacing the top and boosting collagen production
underneath. After several sessions, indented scars should be leveled
off.